INHERITANCE IN ABNORMALITIES 



419 



vivm^ individual was an abnormal animal which gave rise by 

 repeated divisions to the further representatives of its race. 

 On two of these occasions the two groups of lines which rose 

 from the two first daughter cells of this single abnormal animal 

 were treated differently; in one group the most normal indi- 

 viduals were selected; in the other group, sister to the first, the 

 most abnormal were selected. The data for these two pairs of 

 groups is given in table 7. In this table, one abnormal-selected 

 line in the first set lived longer than 56 days; in the second set 

 one normal-selected line lived longer than 20 days; both however 

 for purposes of comparison are counted in this table as having 

 died out at the same time with the other lines of their sets. 



TABLE 6 

 Data from the 4^ abnormal-selected lines of Race C 



TABLE 7 



Data from two sets of sister groups of lines; in one group of each set the most 

 abnormal were selected; in the other group, the ynost normal 



THE JOURNAL OF EXPERIMENTAL ZOOLOGY, VOL. 19, NO. 4 



